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Composition of loans held-in-portfolio (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held-in-portfolio, unearned income $ 97,255 $ 100,596
Loans held-for-sale $ 337,049 $ 363,093